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What are symptoms of tube failure in Benz Shuttle 6.0?

Discussion in 'Amps [BG]' started by Lee Barker, Dec 28, 2012.


  1. Lee Barker

    Lee Barker Supporting Member

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    I'm chasing a signal chain problem and one of the unknowns is the condition of the tube. I look forward to the value of your experience!

    Kindly,

    Lee
     
  2. jlepre

    jlepre

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    There are a few different symptoms.

    I would just call Genz. They have top notch support. They will troubleshoot over the phone.
     
  3. CL400Peavey

    CL400Peavey Supporting Member

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    +1

    also pre amp tubes are fairly cheap and can easily be replaced with any technical knowledge.
     
  4. agedhorse

    agedhorse Development Engineer-Mesa, Product Support-Genz Supporting Member

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    Lee, what are the symptoms you are experiencing?
     
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  6. jlepre

    jlepre

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    I knew I forgot to ask something
     
  7. will33

    will33

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    Here's your help, straight from the source.^^

    Tube can make a few different sounds depending on how it's failing. No sound, very quiet sound, hit and miss sound, staticy crackly sound, microphonic (ringing).

    Eliminate bad cables first. Patch through the effects loop jacks. Try plugging bass in effects return. Make sure tube is seated tight in it's socket. Change battery in active bass. Change tube.

    If you're using any pedals, take them out of the chain and plug straight in the amp for troubleshooting.
     
  8. Lee Barker

    Lee Barker Supporting Member

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    After an hour to an hour and a half of playing, the volume decreases slightly (and then appears to stay constant) and the tone becomes muddier--less clarity.

    I have changed the battery in my active instrument. Cable is unlikely candidate for failure.

    Jazz duo, wining and dining = quite low volumes in controlled environments.

    Kindly,

    Lee
     
  9. CL400Peavey

    CL400Peavey Supporting Member

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    What cab are you using for this low volume gig?
     
  10. jlepre

    jlepre

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    Why not just cut to the chase, and call Genz. Is it still in warranty? If not they can still give you some sound advise as to how to rectify this problem.

    Listen to Agedhorse as he is a very good source from Genz. He has helped MANY on this forum.
     
  11. will33

    will33

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    +1

    Some of the best CS in the business.

    Are you able to replicate your problem in different situations, volumes, etc. or is it specific to this gig/venue?.
     
  12. jlepre

    jlepre

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    I was thinking the same thing. Maybe bad/inconsistent power?
     
  13. agedhorse

    agedhorse Development Engineer-Mesa, Product Support-Genz Supporting Member

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    With these symptoms, the first thing I would suspect is ear fatigue... more common than you might imagine.

    It could be a tube problem as well, it's easy enough to check by swapping the tube.
     
  14. will33

    will33

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    Yeah that, or the ear fatigue Agedhorse mentioned. Don't if he's running few enough speakers hard enough for power compression to become an issue in a wine/dine gig, but it not happening until after an hour/hour and a half of play time could point to any one of those. A tube problem should present itself sooner I would think.
     
  15. Lee Barker

    Lee Barker Supporting Member

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    Thanks for the helpful input. I did order a new tube.

    This has occurred at the last two gigs (different venues) and at rehearsal. None of these places would have suspicious power. Now on the list, however, to think about.

    I hadn't considered ear fatigue. With a duo, rehearsing at living room levels, we both noticed. I would put that lower on the list of possibilities...but, on the list.

    Kindly,

    Lee
     
  16. will33

    will33

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    That is odd then, and gets outside of the usual failure modes and various other things "gone whacky" in the usual playing situations.
     

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